Bosch Rexroth | S20P05-1X-SO74
S20P05-1X/ SO74
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The S20P05-1X/ SO74 valve is produced by Bosch Rexroth for the Type S Check Valves series and supports one-direction flow control in hydraulic automation. A nominal size of 20 matches standard manifold cavities, while the 42 mm body diameter provides adequate wall thickness for pressure containment. Overall length is limited to 15.5 mm, which shortens stacking height in sandwich assemblies. At 1.0 kg, the valve can be installed by one technician without lifting aids, and a 36 mm wrench size defines the tool required for proper tightening. The component withstands operating pressures up to 450 bar so it can be placed close to high-pressure pumps or actuators. A cracking pressure of 0.5 bar allows it to open with minimal upstream differential, limiting energy loss during low-load cycles. It is compatible with mineral-oil fluids classified as HL, HLP, HLPD, HVLP, and HVLPD, and it accepts viscosities up to 500 mm²/s to accommodate cold-start conditions.
The valve tolerates fluid temperatures from -30 °C to 80 °C, allowing use in outdoor machinery that experiences seasonal extremes. A minimum viscosity of 2.8 mm²/s ensures that internal clearances receive sufficient lubrication before the oil thins at elevated temperatures. It can also be filled with flame-resistant media HFDU or HFC when fire safety policies prohibit mineral oil, and it supports bio-based HETG, HEES, and HEPG fluids for environmentally sensitive sites. The required cleanliness level of ISO 4406 20/18/15 limits particle contamination that could prevent the poppet from seating fully. An MTTFd value of 150 years indicates a very low probability of dangerous failure, which simplifies risk calculations in safety-related circuits. These characteristics complete the technical profile and define the operational limits for reliable service life in automated hydraulic systems.
Technical Specifications
Bio-fluid
HETG, HEES, HEPG
Body Diameter (Ød1)
42 mm
Cleanliness Class
ISO 4406 20/18/15
Cracking Pressure
0.5 bar
Flame-resistant Fluid
HFDU, HFC
Hydraulic Fluid (mineral Oil)
HL, HLP, HLPD, HVLP, HVLPD
Length (l2)
15.5 mm
Max Fluid Temperature
80 °C
Max Viscosity
500 mm2/s
Maximum Operating Pressure
450 bar
Min Fluid Temperature
-30 °C
Min Viscosity
2.8 mm2/s
Mttfd Value
150 years
Nominal Size
20
Weight
1.0 kg
Wrench Size (sw)
36 mm
1620 Old Apex Road
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